Star Wars Republic Commando: Order 66

Star Wars Republic Commando: Order 66 (also known as Star Wars: Order 66: A Republic Commando Novel) is the fourth novel in the Republic Commando series, written by Karen Traviss, was released on 16 September 2008.

Plot
Etain Tur-Mukan finally tells Darman that her son, Kad Skirata, who is under the guise of Kal Skirata's grandchild from one of his biological children, is also Darman's son. Though Darman is angered by this initially for Etain and Skirata keeping this from him, he finally starts to spend time with Etain and Kad during their "quiet" moments when he and Etain are not out in battle in the Clone Wars.

Skirata becomes a wanted man in the Old Republic because of him falsely stating that he killed Kaminoan geneticist Ko Sai, who played a major role in creating the Jango Fett clones, and then stole her data. And during that time, Skirata manages to bust Ovolot Qail Uthan, Separatist scientist imprisoned three years earlier by Omega Squad for trying to create a Fett clone virus, from prison because Skirata believes that despite her actions, he sees her as the ultimate key to giving the Fett clones a normal life span, since their life spans are lengthened by double the time (e.g., if they are chronologically two years old, then they're biologically four years old, etc.). Along with busting Uthan from prison is Arla Fett, Jango Fett's long lost insane sister, and Ruusaan Skirata, Kal's biological daughter. Meanwhile, Besany Wennen, Republic Treasury agent who is now married to one of Skirata's clones, Ordo, is almost caught by the authorities for sneaking into data files to find out the Republic's plan for the clones in the near future of the war. However, the Gurlanins, who have reclaimed their home planet of Qiilura from the colonist humans under the machinations of Etain, decide to repay the debt by framing Besany's friend, Jilka Zan Zentis, for the crime. However, under Skirata's hand, Jilka is set free from the authorities, a wanted fugitive now, and under Skirata's band.

But just when Skirata's plans for bringing a positive future for his clone adopted sons seem to come into fruition, Chancellor Palpatine enacts Order 66, which means that all clones must kill off their Jedi commanders. Etain managed to have renounced her Jedi ways prior to Order 66's enactment and married Darman in a traditional Mandalorian way over a comm message. But Etain is trapped on a bridge on Coruscant with many other citizens of the Republic by clone troopers who are scanning for any Jedi to be killed in the crowd. Skirata, Darman and Skirata's other clones arrive to extract Etain, but Jedi are found among the crowd. And during the ensuing battle, Etain protects a clone from being killed by a Jedi wielding a lightsaber, and she is killed from the wound. Darman's fellow clone brother, Niner, is wounded from the battle when his spine is broken, and clones extract Niner to heal him up, with Darman following along to stay with his wounded brother, now that he is grieving for his lost wife.

Skirata and all the others leave Coruscant and head for the Mandalorian home planet of Mandalore just as the Clone Wars come to an end, along with the Jedi Order thanks to Order 66 and of the Republic, being replaced by Palpatine's self-promotion to Emperor of the new Galactic Empire. As for Darman and Niner, they are now Imperial Commandos.